Question: Table 6.17, refers to the effectiveness of immediately injected or 1 hour-de1ayed penicillin in protecting rabbits against lethal injection with -hemolytic streptococci. a. Let

Table 6.17, refers to the effectiveness of immediately injected or 1 ½ hour-de1ayed penicillin in protecting rabbits against lethal injection with β-hemolytic streptococci.

a. Let X = delay, Y = whether cured, and Z = penicillin level. Fit the logit model (6.4). Argue that the pattern of 0 cell counts suggests that (with no intercept) β̂_I^Z = – ∞ and β̂₅^Z = ∞. What does your software report?

b. Using the Logit model, conduct the likelihood-ratio test of XY conditional independence. Interpret.

c. Test XY conditional independence using the Cochran – Mantel – Haenszel test. Interpret.

d. Estimate the XY conditional odds ratio using (i) ML with the logit model, and (ii) the Mantel – Haenszel estimate. Interpret.

e. The small cell counts make large-sample analyses questionnable.

Conduct small-sample inference, and interpret.

Table 6.17:

Table 6.17, refers to the effectiveness of immediately injected or 1 ½

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a The logit model 64 is given by the equation logitPY 1 0 1X 2Z The pattern of 0 cell counts suggests that with no intercept 1Z and 2Z This means that ... View full answer

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